Tru-maxx 66253255487 Surface Grinding Wheel 150 Grit

Product Description

The TRU-MAXX 66253255487 is a Type 1 surface grinding wheel designed for precision material removal on surface grinders. It measures 7 inches in diameter, 1/4 inch thick, and carries a 1-1/4 inch arbor hole. The wheel is made from white aluminum oxide abrasive with a vitrified bond and a grain structure of 6, giving it a non-porous, semi-friable cutting action suited to fine-finish grinding. At 150 grit with a K hardness code (medium), it falls in the very fine grade range — well-suited for light stock removal and finishing passes on ferrous metals. Maximum operating speed is 3600 RPM. Specification code 28A150K6V31 identifies the full abrasive formulation for shops that cross-reference by spec.

This wheel is used on horizontal and vertical spindle surface grinders in tool rooms, machine shops, and maintenance facilities. The 150 grit and K hardness combination is a common choice for finishing hardened steel, tool steel, and similar ferrous workpieces where surface finish quality matters as much as material removal rate. The vitrified bond holds the aluminum oxide grains firmly while still allowing controlled breakdown, which helps maintain wheel geometry over the grinding pass. A licensed machinist or toolroom technician typically selects and mounts this wheel as part of routine surface grinding operations.

Key Features

• Type 1 straight wheel profile — standard configuration for most surface grinder spindle setups
• White aluminum oxide abrasive — semi-friable grain that self-sharpens during use on ferrous materials
• Vitrified bond — non-porous construction that resists loading and holds form under moderate grinding pressure
• 150 grit, K hardness (medium) — very fine grade suitable for finishing passes and tight surface finish requirements
• 3600 RPM maximum operating speed — verify this does not exceed the surface grinder spindle rating before mounting
• Grain structure 6 with specification code 28A150K6V31 for precise abrasive identification

Compatibility

Designed as a replacement-style Type 1 surface grinding wheel for horizontal or vertical spindle surface grinders accepting a 7-inch diameter, 1/4-inch wide wheel with a 1-1/4 inch arbor bore.

Installation Notes

Grinding wheel mounting must be performed by a qualified operator following ANSI B7.1 safety standards for the use, care, and protection of abrasive wheels. Before mounting, perform a ring test to check for cracks — a damaged wheel must never be installed. Ensure the machine spindle speed does not exceed the wheel maximum of 3600 RPM, and use proper flange hardware with blotters as required. Always install and dress the wheel with the machine guard in place, and allow the wheel to run at operating speed for at least one minute before bringing it into contact with the workpiece.